Categories: Malware

Delf.73 (file analysis)

The Delf.73 is considered dangerous by lots of security experts. When this infection is active, you may notice unwanted processes in Task Manager list. In this case, it is adviced to scan your computer with GridinSoft Anti-Malware.

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What Delf.73 virus can do?

  • Performs HTTP requests potentially not found in PCAP.
  • Reads data out of its own binary image
  • CAPE extracted potentially suspicious content
  • Unconventionial language used in binary resources: Swahili
  • The binary contains an unknown PE section name indicative of packing
  • The binary likely contains encrypted or compressed data.
  • The executable is compressed using UPX
  • Authenticode signature is invalid
  • Behavioural detection: Injection (Process Hollowing)
  • Behavioural detection: Injection (inter-process)
  • Checks for the presence of known windows from debuggers and forensic tools
  • Attempts to identify installed analysis tools by registry key
  • Detects VirtualBox through the presence of a registry key
  • Enumerates physical drives
  • Attempts to modify proxy settings
  • Creates a copy of itself
  • Deletes executed files from disk
  • The sample wrote data to the system hosts file.
  • Collects information to fingerprint the system
  • Yara detections observed in process dumps, payloads or dropped files

How to determine Delf.73?


File Info:

name: 00441B8B5E9876D7DB1D.mlwpath: /opt/CAPEv2/storage/binaries/0fc19b1a047100b750b1af661d058d3f231e0e740c4f7edb92165a45d5800c04crc32: A321CA87md5: 00441b8b5e9876d7db1df3c2bad4a6bdsha1: a1ce550aeda08231ecdc96fd9970e586e8346aeasha256: 0fc19b1a047100b750b1af661d058d3f231e0e740c4f7edb92165a45d5800c04sha512: 9f362f9c1f53357daa13e40ace34af2b01f718597a9a011b4b84e11c43e4270f79d0198e7e2748503638db124dc8468ebf2a6fa0c722380cad752c575767d157ssdeep: 12288:4DGI8Zsxgb0FK3ARkKWhZ4FoKMDhtJ8IpaCAO7G1xYfg9k+1A0G6FjuaFU:4DFpM0Q3trZ46KMDhfX7Nfck+1AcjLtype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T1B6E41253A3D70EAAE5B23AFEC5C90A75509F1E141630F6BE8434B93687344D7CC9682Esha3_384: 0852129fb274ed0f1310615648988ea588eba8593da3be4069fe66988e61bac6499b5898acf636a4d6f21dd3ce06275dep_bytes: 60be007044008dbe00a0fbffc78784d0timestamp: 1992-06-19 22:22:17

Version Info:

0: [No Data]

Delf.73 also known as:

Bkav W32.AIDetectMalware
Lionic Trojan.Win32.Generic.4!c
Elastic malicious (moderate confidence)
Cynet Malicious (score: 100)
FireEye Generic.mg.00441b8b5e9876d7
CAT-QuickHeal Backdoor.Simda.Gen
Skyhigh BehavesLike.Win32.Corrupt.jc
McAfee FakeAlert-FDI!00441B8B5E98
Cylance unsafe
Sangfor Trojan.Win32.Delphi.Gen
CrowdStrike win/malicious_confidence_90% (D)
Alibaba Backdoor:Win32/Injector.4c21d325
K7GW Trojan ( 00565c861 )
K7AntiVirus Trojan ( 00565c861 )
Symantec ML.Attribute.HighConfidence
tehtris Generic.Malware
ESET-NOD32 a variant of Win32/Injector.PLT
APEX Malicious
ClamAV Win.Trojan.Buzus-19023
Kaspersky HEUR:Trojan.Win32.Generic
BitDefender Gen:Variant.Delf.73
NANO-Antivirus Trojan.Win32.Buzus.dpikiq
MicroWorld-eScan Gen:Variant.Delf.73
Avast Win32:FakeAV-DEM [Trj]
Rising Backdoor.Simda!8.2D9 (CLOUD)
Emsisoft Gen:Variant.Delf.73 (B)
F-Secure Dropper.DR/Delphi.Gen
DrWeb Trojan.Rodricter.3
VIPRE Gen:Variant.Delf.73
Trapmine malicious.high.ml.score
Sophos Mal/EncPk-AGD
Ikarus Trojan.Win32.FakeAV
GData Gen:Variant.Delf.73
Jiangmin Trojan/Buzus.bfhm
Webroot W32.Rogue.Gen
Varist W32/Simda.B.gen!Eldorado
Avira DR/Delphi.Gen
Antiy-AVL Trojan/Win32.Inject
Kingsoft Win32.Trojan.Generic.a
Xcitium TrojWare.Win32.Injector.sbp@4nivqt
Arcabit Trojan.Delf.73
ViRobot Trojan.Win32.A.Buzus.662016[UPX]
ZoneAlarm HEUR:Trojan.Win32.Generic
Microsoft Backdoor:Win32/Simda
Google Detected
AhnLab-V3 Trojan/Win32.Buzus.R23318
BitDefenderTheta AI:Packer.77325AD221
ALYac Gen:Variant.Delf.73
MAX malware (ai score=100)
VBA32 Trojan.Buzus
Malwarebytes Generic.Malware/Suspicious
Panda Trj/Pacrypt.E
TrendMicro-HouseCall HV_ZYX_BG310125.TOMC
Tencent Win32.Trojan.Generic.Edhl
Yandex Trojan.Buzus!jca18D76iYY
SentinelOne Static AI – Suspicious PE
MaxSecure Trojan.Malware.3754912.susgen
Fortinet W32/Buzus.NT!tr
AVG Win32:FakeAV-DEM [Trj]
Cybereason malicious.aeda08
DeepInstinct MALICIOUS

How to remove Delf.73?

  • Download and install GridinSoft Anti-Malware.
  • Open GridinSoft Anti-Malware and perform a “Standard scan“.
  • Move to quarantine” all items.
  • Open “Tools” tab – Press “Reset Browser Settings“.
  • Select proper browser and options – Click “Reset”.
  • Restart your computer.
Paul Valéry

I'm a cyber security analyst and data science expert with 5+ years of experience with security software contractors.

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